mirror of https://git.ffmpeg.org/ffmpeg.git
2292 lines
86 KiB
C
2292 lines
86 KiB
C
/*
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* MPEG4 decoder.
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* Copyright (c) 2000,2001 Fabrice Bellard
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* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mpegvideo.h"
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#include "mpeg4video.h"
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#include "h263.h"
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#include "thread.h"
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// The defines below define the number of bits that are read at once for
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// reading vlc values. Changing these may improve speed and data cache needs
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// be aware though that decreasing them may need the number of stages that is
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// passed to get_vlc* to be increased.
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#define SPRITE_TRAJ_VLC_BITS 6
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#define DC_VLC_BITS 9
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#define MB_TYPE_B_VLC_BITS 4
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static VLC dc_lum, dc_chrom;
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static VLC sprite_trajectory;
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static VLC mb_type_b_vlc;
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static const int mb_type_b_map[4]= {
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MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
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MB_TYPE_L0L1 | MB_TYPE_16x16,
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MB_TYPE_L1 | MB_TYPE_16x16,
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MB_TYPE_L0 | MB_TYPE_16x16,
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};
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/**
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* predicts the ac.
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* @param n block index (0-3 are luma, 4-5 are chroma)
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* @param dir the ac prediction direction
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*/
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void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
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int dir)
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{
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int i;
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int16_t *ac_val, *ac_val1;
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int8_t * const qscale_table = s->current_picture.f.qscale_table;
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/* find prediction */
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ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
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ac_val1 = ac_val;
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if (s->ac_pred) {
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if (dir == 0) {
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const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
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/* left prediction */
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ac_val -= 16;
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if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
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/* same qscale */
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for(i=1;i<8;i++) {
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block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
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}
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}else{
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/* different qscale, we must rescale */
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for(i=1;i<8;i++) {
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block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
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}
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}
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} else {
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const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
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/* top prediction */
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ac_val -= 16 * s->block_wrap[n];
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if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
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/* same qscale */
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for(i=1;i<8;i++) {
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block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
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}
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}else{
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/* different qscale, we must rescale */
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for(i=1;i<8;i++) {
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block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
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}
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}
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}
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}
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/* left copy */
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for(i=1;i<8;i++)
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ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
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/* top copy */
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for(i=1;i<8;i++)
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ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
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}
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/**
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* check if the next stuff is a resync marker or the end.
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* @return 0 if not
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*/
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static inline int mpeg4_is_resync(MpegEncContext *s){
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int bits_count= get_bits_count(&s->gb);
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int v= show_bits(&s->gb, 16);
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if(s->workaround_bugs&FF_BUG_NO_PADDING){
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return 0;
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}
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while(v<=0xFF){
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if(s->pict_type==AV_PICTURE_TYPE_B || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
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break;
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skip_bits(&s->gb, 8+s->pict_type);
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bits_count+= 8+s->pict_type;
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v= show_bits(&s->gb, 16);
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}
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if(bits_count + 8 >= s->gb.size_in_bits){
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v>>=8;
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v|= 0x7F >> (7-(bits_count&7));
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if(v==0x7F)
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return 1;
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}else{
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if(v == ff_mpeg4_resync_prefix[bits_count&7]){
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int len;
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GetBitContext gb= s->gb;
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skip_bits(&s->gb, 1);
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align_get_bits(&s->gb);
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for(len=0; len<32; len++){
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if(get_bits1(&s->gb)) break;
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}
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s->gb= gb;
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if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
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return 1;
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}
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}
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return 0;
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}
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static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
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{
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int i;
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int a= 2<<s->sprite_warping_accuracy;
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int rho= 3-s->sprite_warping_accuracy;
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int r=16/a;
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const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
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int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
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int sprite_ref[4][2];
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int virtual_ref[2][2];
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int w2, h2, w3, h3;
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int alpha=0, beta=0;
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int w= s->width;
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int h= s->height;
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int min_ab;
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for(i=0; i<s->num_sprite_warping_points; i++){
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int length;
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int x=0, y=0;
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length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
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if(length){
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x= get_xbits(gb, length);
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}
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if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
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length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
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if(length){
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y=get_xbits(gb, length);
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}
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skip_bits1(gb); /* marker bit */
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s->sprite_traj[i][0]= d[i][0]= x;
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s->sprite_traj[i][1]= d[i][1]= y;
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}
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for(; i<4; i++)
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s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
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while((1<<alpha)<w) alpha++;
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while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
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w2= 1<<alpha;
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h2= 1<<beta;
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// Note, the 4th point isn't used for GMC
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if(s->divx_version==500 && s->divx_build==413){
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sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
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sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
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sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
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sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
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sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
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sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
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} else {
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sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
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sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
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sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
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sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
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sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
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sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
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}
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/* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
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sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
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// this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
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// perhaps it should be reordered to be more readable ...
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// the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
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// so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
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virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
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+ ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w);
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virtual_ref[0][1]= 16*vop_ref[0][1]
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+ ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w);
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virtual_ref[1][0]= 16*vop_ref[0][0]
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+ ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h);
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virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
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+ ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),h);
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switch(s->num_sprite_warping_points)
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{
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case 0:
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s->sprite_offset[0][0]= 0;
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s->sprite_offset[0][1]= 0;
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s->sprite_offset[1][0]= 0;
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s->sprite_offset[1][1]= 0;
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s->sprite_delta[0][0]= a;
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s->sprite_delta[0][1]= 0;
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s->sprite_delta[1][0]= 0;
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s->sprite_delta[1][1]= a;
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s->sprite_shift[0]= 0;
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s->sprite_shift[1]= 0;
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break;
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case 1: //GMC only
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s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
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s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
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s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
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s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
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s->sprite_delta[0][0]= a;
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s->sprite_delta[0][1]= 0;
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s->sprite_delta[1][0]= 0;
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s->sprite_delta[1][1]= a;
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s->sprite_shift[0]= 0;
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s->sprite_shift[1]= 0;
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break;
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case 2:
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s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
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+ (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
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+ ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
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+ (1<<(alpha+rho-1));
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s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
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+ (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
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+ (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
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+ (1<<(alpha+rho-1));
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s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
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+( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
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+2*w2*r*sprite_ref[0][0]
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- 16*w2
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+ (1<<(alpha+rho+1)));
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s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
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+(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
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+2*w2*r*sprite_ref[0][1]
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- 16*w2
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+ (1<<(alpha+rho+1)));
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s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
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s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
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s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
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s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
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s->sprite_shift[0]= alpha+rho;
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s->sprite_shift[1]= alpha+rho+2;
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break;
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case 3:
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min_ab= FFMIN(alpha, beta);
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w3= w2>>min_ab;
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h3= h2>>min_ab;
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s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
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+ (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
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+ (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
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+ (1<<(alpha+beta+rho-min_ab-1));
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s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
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+ (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
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+ (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
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+ (1<<(alpha+beta+rho-min_ab-1));
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s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
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+ (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
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+ 2*w2*h3*r*sprite_ref[0][0]
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- 16*w2*h3
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+ (1<<(alpha+beta+rho-min_ab+1));
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s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
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+ (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
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+ 2*w2*h3*r*sprite_ref[0][1]
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- 16*w2*h3
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+ (1<<(alpha+beta+rho-min_ab+1));
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s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
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s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
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s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
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s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
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s->sprite_shift[0]= alpha + beta + rho - min_ab;
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s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
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break;
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}
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/* try to simplify the situation */
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if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
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&& s->sprite_delta[0][1] == 0
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&& s->sprite_delta[1][0] == 0
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&& s->sprite_delta[1][1] == a<<s->sprite_shift[0])
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{
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s->sprite_offset[0][0]>>=s->sprite_shift[0];
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s->sprite_offset[0][1]>>=s->sprite_shift[0];
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s->sprite_offset[1][0]>>=s->sprite_shift[1];
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s->sprite_offset[1][1]>>=s->sprite_shift[1];
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s->sprite_delta[0][0]= a;
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s->sprite_delta[0][1]= 0;
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s->sprite_delta[1][0]= 0;
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s->sprite_delta[1][1]= a;
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s->sprite_shift[0]= 0;
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s->sprite_shift[1]= 0;
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s->real_sprite_warping_points=1;
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}
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else{
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int shift_y= 16 - s->sprite_shift[0];
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int shift_c= 16 - s->sprite_shift[1];
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for(i=0; i<2; i++){
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s->sprite_offset[0][i]<<= shift_y;
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s->sprite_offset[1][i]<<= shift_c;
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s->sprite_delta[0][i]<<= shift_y;
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s->sprite_delta[1][i]<<= shift_y;
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s->sprite_shift[i]= 16;
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}
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s->real_sprite_warping_points= s->num_sprite_warping_points;
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}
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}
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/**
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* decodes the next video packet.
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* @return <0 if something went wrong
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*/
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int mpeg4_decode_video_packet_header(MpegEncContext *s)
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{
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int mb_num_bits= av_log2(s->mb_num - 1) + 1;
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int header_extension=0, mb_num, len;
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/* is there enough space left for a video packet + header */
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if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
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for(len=0; len<32; len++){
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if(get_bits1(&s->gb)) break;
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}
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if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
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av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
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return -1;
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}
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if(s->shape != RECT_SHAPE){
|
|
header_extension= get_bits1(&s->gb);
|
|
//FIXME more stuff here
|
|
}
|
|
|
|
mb_num= get_bits(&s->gb, mb_num_bits);
|
|
if(mb_num>=s->mb_num){
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
|
|
return -1;
|
|
}
|
|
if(s->pict_type == AV_PICTURE_TYPE_B){
|
|
int mb_x = 0, mb_y = 0;
|
|
|
|
while (s->next_picture.f.mbskip_table[s->mb_index2xy[mb_num]]) {
|
|
if (!mb_x) ff_thread_await_progress((AVFrame*)s->next_picture_ptr, mb_y++, 0);
|
|
mb_num++;
|
|
if (++mb_x == s->mb_width) mb_x = 0;
|
|
}
|
|
if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
|
|
}
|
|
|
|
s->mb_x= mb_num % s->mb_width;
|
|
s->mb_y= mb_num / s->mb_width;
|
|
|
|
if(s->shape != BIN_ONLY_SHAPE){
|
|
int qscale= get_bits(&s->gb, s->quant_precision);
|
|
if(qscale)
|
|
s->chroma_qscale=s->qscale= qscale;
|
|
}
|
|
|
|
if(s->shape == RECT_SHAPE){
|
|
header_extension= get_bits1(&s->gb);
|
|
}
|
|
if(header_extension){
|
|
int time_incr=0;
|
|
|
|
while (get_bits1(&s->gb) != 0)
|
|
time_incr++;
|
|
|
|
check_marker(&s->gb, "before time_increment in video packed header");
|
|
skip_bits(&s->gb, s->time_increment_bits); /* time_increment */
|
|
check_marker(&s->gb, "before vop_coding_type in video packed header");
|
|
|
|
skip_bits(&s->gb, 2); /* vop coding type */
|
|
//FIXME not rect stuff here
|
|
|
|
if(s->shape != BIN_ONLY_SHAPE){
|
|
skip_bits(&s->gb, 3); /* intra dc vlc threshold */
|
|
//FIXME don't just ignore everything
|
|
if(s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
|
|
mpeg4_decode_sprite_trajectory(s, &s->gb);
|
|
av_log(s->avctx, AV_LOG_ERROR, "untested\n");
|
|
}
|
|
|
|
//FIXME reduced res stuff here
|
|
|
|
if (s->pict_type != AV_PICTURE_TYPE_I) {
|
|
int f_code = get_bits(&s->gb, 3); /* fcode_for */
|
|
if(f_code==0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
|
|
}
|
|
}
|
|
if (s->pict_type == AV_PICTURE_TYPE_B) {
|
|
int b_code = get_bits(&s->gb, 3);
|
|
if(b_code==0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//FIXME new-pred stuff
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* gets the average motion vector for a GMC MB.
|
|
* @param n either 0 for the x component or 1 for y
|
|
* @return the average MV for a GMC MB
|
|
*/
|
|
static inline int get_amv(MpegEncContext *s, int n){
|
|
int x, y, mb_v, sum, dx, dy, shift;
|
|
int len = 1 << (s->f_code + 4);
|
|
const int a= s->sprite_warping_accuracy;
|
|
|
|
if(s->workaround_bugs & FF_BUG_AMV)
|
|
len >>= s->quarter_sample;
|
|
|
|
if(s->real_sprite_warping_points==1){
|
|
if(s->divx_version==500 && s->divx_build==413)
|
|
sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
|
|
else
|
|
sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
|
|
}else{
|
|
dx= s->sprite_delta[n][0];
|
|
dy= s->sprite_delta[n][1];
|
|
shift= s->sprite_shift[0];
|
|
if(n) dy -= 1<<(shift + a + 1);
|
|
else dx -= 1<<(shift + a + 1);
|
|
mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
|
|
|
|
sum=0;
|
|
for(y=0; y<16; y++){
|
|
int v;
|
|
|
|
v= mb_v + dy*y;
|
|
//XXX FIXME optimize
|
|
for(x=0; x<16; x++){
|
|
sum+= v>>shift;
|
|
v+= dx;
|
|
}
|
|
}
|
|
sum= RSHIFT(sum, a+8-s->quarter_sample);
|
|
}
|
|
|
|
if (sum < -len) sum= -len;
|
|
else if (sum >= len) sum= len-1;
|
|
|
|
return sum;
|
|
}
|
|
|
|
/**
|
|
* decodes the dc value.
|
|
* @param n block index (0-3 are luma, 4-5 are chroma)
|
|
* @param dir_ptr the prediction direction will be stored here
|
|
* @return the quantized dc
|
|
*/
|
|
static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
|
|
{
|
|
int level, code;
|
|
|
|
if (n < 4)
|
|
code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
|
|
else
|
|
code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
|
|
if (code < 0 || code > 9 /* && s->nbit<9 */){
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
|
|
return -1;
|
|
}
|
|
if (code == 0) {
|
|
level = 0;
|
|
} else {
|
|
if(IS_3IV1){
|
|
if(code==1)
|
|
level= 2*get_bits1(&s->gb)-1;
|
|
else{
|
|
if(get_bits1(&s->gb))
|
|
level = get_bits(&s->gb, code-1) + (1<<(code-1));
|
|
else
|
|
level = -get_bits(&s->gb, code-1) - (1<<(code-1));
|
|
}
|
|
}else{
|
|
level = get_xbits(&s->gb, code);
|
|
}
|
|
|
|
if (code > 8){
|
|
if(get_bits1(&s->gb)==0){ /* marker */
|
|
if(s->error_recognition>=2){
|
|
av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
|
|
}
|
|
|
|
/**
|
|
* decodes first partition.
|
|
* @return number of MBs decoded or <0 if an error occurred
|
|
*/
|
|
static int mpeg4_decode_partition_a(MpegEncContext *s){
|
|
int mb_num;
|
|
static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
|
|
|
|
/* decode first partition */
|
|
mb_num=0;
|
|
s->first_slice_line=1;
|
|
for(; s->mb_y<s->mb_height; s->mb_y++){
|
|
ff_init_block_index(s);
|
|
for(; s->mb_x<s->mb_width; s->mb_x++){
|
|
const int xy= s->mb_x + s->mb_y*s->mb_stride;
|
|
int cbpc;
|
|
int dir=0;
|
|
|
|
mb_num++;
|
|
ff_update_block_index(s);
|
|
if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
|
|
s->first_slice_line=0;
|
|
|
|
if(s->pict_type==AV_PICTURE_TYPE_I){
|
|
int i;
|
|
|
|
do{
|
|
if(show_bits_long(&s->gb, 19)==DC_MARKER){
|
|
return mb_num-1;
|
|
}
|
|
|
|
cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
|
|
if (cbpc < 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
}while(cbpc == 8);
|
|
|
|
s->cbp_table[xy]= cbpc & 3;
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
|
|
s->mb_intra = 1;
|
|
|
|
if(cbpc & 4) {
|
|
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
|
|
}
|
|
s->current_picture.f.qscale_table[xy]= s->qscale;
|
|
|
|
s->mbintra_table[xy]= 1;
|
|
for(i=0; i<6; i++){
|
|
int dc_pred_dir;
|
|
int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
|
|
if(dc < 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
dir<<=1;
|
|
if(dc_pred_dir) dir|=1;
|
|
}
|
|
s->pred_dir_table[xy]= dir;
|
|
}else{ /* P/S_TYPE */
|
|
int mx, my, pred_x, pred_y, bits;
|
|
int16_t * const mot_val = s->current_picture.f.motion_val[0][s->block_index[0]];
|
|
const int stride= s->b8_stride*2;
|
|
|
|
try_again:
|
|
bits= show_bits(&s->gb, 17);
|
|
if(bits==MOTION_MARKER){
|
|
return mb_num-1;
|
|
}
|
|
skip_bits1(&s->gb);
|
|
if(bits&0x10000){
|
|
/* skip mb */
|
|
if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
|
|
mx= get_amv(s, 0);
|
|
my= get_amv(s, 1);
|
|
}else{
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
|
|
mx=my=0;
|
|
}
|
|
mot_val[0 ]= mot_val[2 ]=
|
|
mot_val[0+stride]= mot_val[2+stride]= mx;
|
|
mot_val[1 ]= mot_val[3 ]=
|
|
mot_val[1+stride]= mot_val[3+stride]= my;
|
|
|
|
if(s->mbintra_table[xy])
|
|
ff_clean_intra_table_entries(s);
|
|
continue;
|
|
}
|
|
|
|
cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
|
|
if (cbpc < 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
if(cbpc == 20)
|
|
goto try_again;
|
|
|
|
s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
|
|
|
|
s->mb_intra = ((cbpc & 4) != 0);
|
|
|
|
if(s->mb_intra){
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
|
|
s->mbintra_table[xy]= 1;
|
|
mot_val[0 ]= mot_val[2 ]=
|
|
mot_val[0+stride]= mot_val[2+stride]= 0;
|
|
mot_val[1 ]= mot_val[3 ]=
|
|
mot_val[1+stride]= mot_val[3+stride]= 0;
|
|
}else{
|
|
if(s->mbintra_table[xy])
|
|
ff_clean_intra_table_entries(s);
|
|
|
|
if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
|
|
s->mcsel= get_bits1(&s->gb);
|
|
else s->mcsel= 0;
|
|
|
|
if ((cbpc & 16) == 0) {
|
|
/* 16x16 motion prediction */
|
|
|
|
h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
|
|
if(!s->mcsel){
|
|
mx = h263_decode_motion(s, pred_x, s->f_code);
|
|
if (mx >= 0xffff)
|
|
return -1;
|
|
|
|
my = h263_decode_motion(s, pred_y, s->f_code);
|
|
if (my >= 0xffff)
|
|
return -1;
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
|
|
} else {
|
|
mx = get_amv(s, 0);
|
|
my = get_amv(s, 1);
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
|
|
}
|
|
|
|
mot_val[0 ]= mot_val[2 ] =
|
|
mot_val[0+stride]= mot_val[2+stride]= mx;
|
|
mot_val[1 ]= mot_val[3 ]=
|
|
mot_val[1+stride]= mot_val[3+stride]= my;
|
|
} else {
|
|
int i;
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
|
|
for(i=0;i<4;i++) {
|
|
int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
|
|
mx = h263_decode_motion(s, pred_x, s->f_code);
|
|
if (mx >= 0xffff)
|
|
return -1;
|
|
|
|
my = h263_decode_motion(s, pred_y, s->f_code);
|
|
if (my >= 0xffff)
|
|
return -1;
|
|
mot_val[0] = mx;
|
|
mot_val[1] = my;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
s->mb_x= 0;
|
|
}
|
|
|
|
return mb_num;
|
|
}
|
|
|
|
/**
|
|
* decode second partition.
|
|
* @return <0 if an error occurred
|
|
*/
|
|
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
|
|
int mb_num=0;
|
|
static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
|
|
|
|
s->mb_x= s->resync_mb_x;
|
|
s->first_slice_line=1;
|
|
for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
|
|
ff_init_block_index(s);
|
|
for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
|
|
const int xy= s->mb_x + s->mb_y*s->mb_stride;
|
|
|
|
mb_num++;
|
|
ff_update_block_index(s);
|
|
if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
|
|
s->first_slice_line=0;
|
|
|
|
if(s->pict_type==AV_PICTURE_TYPE_I){
|
|
int ac_pred= get_bits1(&s->gb);
|
|
int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
|
|
if(cbpy<0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
s->cbp_table[xy]|= cbpy<<2;
|
|
s->current_picture.f.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
|
|
}else{ /* P || S_TYPE */
|
|
if (IS_INTRA(s->current_picture.f.mb_type[xy])) {
|
|
int dir=0,i;
|
|
int ac_pred = get_bits1(&s->gb);
|
|
int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
|
|
|
|
if(cbpy<0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
if(s->cbp_table[xy] & 8) {
|
|
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
|
|
}
|
|
s->current_picture.f.qscale_table[xy] = s->qscale;
|
|
|
|
for(i=0; i<6; i++){
|
|
int dc_pred_dir;
|
|
int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
|
|
if(dc < 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
dir<<=1;
|
|
if(dc_pred_dir) dir|=1;
|
|
}
|
|
s->cbp_table[xy]&= 3; //remove dquant
|
|
s->cbp_table[xy]|= cbpy<<2;
|
|
s->current_picture.f.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
|
|
s->pred_dir_table[xy]= dir;
|
|
} else if (IS_SKIP(s->current_picture.f.mb_type[xy])) {
|
|
s->current_picture.f.qscale_table[xy] = s->qscale;
|
|
s->cbp_table[xy]= 0;
|
|
}else{
|
|
int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
|
|
|
|
if(cbpy<0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
if(s->cbp_table[xy] & 8) {
|
|
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
|
|
}
|
|
s->current_picture.f.qscale_table[xy] = s->qscale;
|
|
|
|
s->cbp_table[xy]&= 3; //remove dquant
|
|
s->cbp_table[xy]|= (cbpy^0xf)<<2;
|
|
}
|
|
}
|
|
}
|
|
if(mb_num >= mb_count) return 0;
|
|
s->mb_x= 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* decodes the first & second partition
|
|
* @return <0 if error (and sets error type in the error_status_table)
|
|
*/
|
|
int ff_mpeg4_decode_partitions(MpegEncContext *s)
|
|
{
|
|
int mb_num;
|
|
const int part_a_error= s->pict_type==AV_PICTURE_TYPE_I ? (DC_ERROR|MV_ERROR) : MV_ERROR;
|
|
const int part_a_end = s->pict_type==AV_PICTURE_TYPE_I ? (DC_END |MV_END) : MV_END;
|
|
|
|
mb_num= mpeg4_decode_partition_a(s);
|
|
if(mb_num<0){
|
|
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
|
|
return -1;
|
|
}
|
|
|
|
if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
|
|
av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
|
|
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
|
|
return -1;
|
|
}
|
|
|
|
s->mb_num_left= mb_num;
|
|
|
|
if(s->pict_type==AV_PICTURE_TYPE_I){
|
|
while(show_bits(&s->gb, 9) == 1)
|
|
skip_bits(&s->gb, 9);
|
|
if(get_bits_long(&s->gb, 19)!=DC_MARKER){
|
|
av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
}else{
|
|
while(show_bits(&s->gb, 10) == 1)
|
|
skip_bits(&s->gb, 10);
|
|
if(get_bits(&s->gb, 17)!=MOTION_MARKER){
|
|
av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
}
|
|
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
|
|
|
|
if( mpeg4_decode_partition_b(s, mb_num) < 0){
|
|
if(s->pict_type==AV_PICTURE_TYPE_P)
|
|
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR);
|
|
return -1;
|
|
}else{
|
|
if(s->pict_type==AV_PICTURE_TYPE_P)
|
|
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* decodes a block.
|
|
* @return <0 if an error occurred
|
|
*/
|
|
static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
|
|
int n, int coded, int intra, int rvlc)
|
|
{
|
|
int level, i, last, run;
|
|
int dc_pred_dir;
|
|
RLTable * rl;
|
|
RL_VLC_ELEM * rl_vlc;
|
|
const uint8_t * scan_table;
|
|
int qmul, qadd;
|
|
|
|
//Note intra & rvlc should be optimized away if this is inlined
|
|
|
|
if(intra) {
|
|
if(s->use_intra_dc_vlc){
|
|
/* DC coef */
|
|
if(s->partitioned_frame){
|
|
level = s->dc_val[0][ s->block_index[n] ];
|
|
if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
|
|
else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
|
|
dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
|
|
}else{
|
|
level = mpeg4_decode_dc(s, n, &dc_pred_dir);
|
|
if (level < 0)
|
|
return -1;
|
|
}
|
|
block[0] = level;
|
|
i = 0;
|
|
}else{
|
|
i = -1;
|
|
ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
|
|
}
|
|
if (!coded)
|
|
goto not_coded;
|
|
|
|
if(rvlc){
|
|
rl = &rvlc_rl_intra;
|
|
rl_vlc = rvlc_rl_intra.rl_vlc[0];
|
|
}else{
|
|
rl = &ff_mpeg4_rl_intra;
|
|
rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
|
|
}
|
|
if (s->ac_pred) {
|
|
if (dc_pred_dir == 0)
|
|
scan_table = s->intra_v_scantable.permutated; /* left */
|
|
else
|
|
scan_table = s->intra_h_scantable.permutated; /* top */
|
|
} else {
|
|
scan_table = s->intra_scantable.permutated;
|
|
}
|
|
qmul=1;
|
|
qadd=0;
|
|
} else {
|
|
i = -1;
|
|
if (!coded) {
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
if(rvlc) rl = &rvlc_rl_inter;
|
|
else rl = &ff_h263_rl_inter;
|
|
|
|
scan_table = s->intra_scantable.permutated;
|
|
|
|
if(s->mpeg_quant){
|
|
qmul=1;
|
|
qadd=0;
|
|
if(rvlc){
|
|
rl_vlc = rvlc_rl_inter.rl_vlc[0];
|
|
}else{
|
|
rl_vlc = ff_h263_rl_inter.rl_vlc[0];
|
|
}
|
|
}else{
|
|
qmul = s->qscale << 1;
|
|
qadd = (s->qscale - 1) | 1;
|
|
if(rvlc){
|
|
rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
|
|
}else{
|
|
rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
|
|
}
|
|
}
|
|
}
|
|
{
|
|
OPEN_READER(re, &s->gb);
|
|
for(;;) {
|
|
UPDATE_CACHE(re, &s->gb);
|
|
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
|
|
if (level==0) {
|
|
/* escape */
|
|
if(rvlc){
|
|
if(SHOW_UBITS(re, &s->gb, 1)==0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
|
|
return -1;
|
|
}; SKIP_CACHE(re, &s->gb, 1);
|
|
|
|
last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
|
|
run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
|
|
SKIP_COUNTER(re, &s->gb, 1+1+6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
|
|
if(SHOW_UBITS(re, &s->gb, 1)==0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
|
|
return -1;
|
|
}; SKIP_CACHE(re, &s->gb, 1);
|
|
|
|
level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
|
|
|
|
if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
|
|
av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
|
|
return -1;
|
|
}; SKIP_CACHE(re, &s->gb, 5);
|
|
|
|
level= level * qmul + qadd;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1);
|
|
SKIP_COUNTER(re, &s->gb, 1+11+5+1);
|
|
|
|
i+= run + 1;
|
|
if(last) i+=192;
|
|
}else{
|
|
int cache;
|
|
cache= GET_CACHE(re, &s->gb);
|
|
|
|
if(IS_3IV1)
|
|
cache ^= 0xC0000000;
|
|
|
|
if (cache&0x80000000) {
|
|
if (cache&0x40000000) {
|
|
/* third escape */
|
|
SKIP_CACHE(re, &s->gb, 2);
|
|
last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
|
|
run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
|
|
SKIP_COUNTER(re, &s->gb, 2+1+6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
|
|
if(IS_3IV1){
|
|
level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
|
|
}else{
|
|
if(SHOW_UBITS(re, &s->gb, 1)==0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
|
|
return -1;
|
|
}; SKIP_CACHE(re, &s->gb, 1);
|
|
|
|
level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
|
|
|
|
if(SHOW_UBITS(re, &s->gb, 1)==0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
|
|
return -1;
|
|
}; LAST_SKIP_CACHE(re, &s->gb, 1);
|
|
|
|
SKIP_COUNTER(re, &s->gb, 1+12+1);
|
|
}
|
|
|
|
#if 0
|
|
if(s->error_recognition >= FF_ER_COMPLIANT){
|
|
const int abs_level= FFABS(level);
|
|
if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
|
|
const int run1= run - rl->max_run[last][abs_level] - 1;
|
|
if(abs_level <= rl->max_level[last][run]){
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
|
|
return -1;
|
|
}
|
|
if(s->error_recognition > FF_ER_COMPLIANT){
|
|
if(abs_level <= rl->max_level[last][run]*2){
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
|
|
return -1;
|
|
}
|
|
if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
if (level>0) level= level * qmul + qadd;
|
|
else level= level * qmul - qadd;
|
|
|
|
if((unsigned)(level + 2048) > 4095){
|
|
if(s->error_recognition > FF_ER_COMPLIANT){
|
|
if(level > 2560 || level<-2560){
|
|
av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
|
|
return -1;
|
|
}
|
|
}
|
|
level= level<0 ? -2048 : 2047;
|
|
}
|
|
|
|
i+= run + 1;
|
|
if(last) i+=192;
|
|
} else {
|
|
/* second escape */
|
|
SKIP_BITS(re, &s->gb, 2);
|
|
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
|
|
i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
LAST_SKIP_BITS(re, &s->gb, 1);
|
|
}
|
|
} else {
|
|
/* first escape */
|
|
SKIP_BITS(re, &s->gb, 1);
|
|
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
|
|
i+= run;
|
|
level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
LAST_SKIP_BITS(re, &s->gb, 1);
|
|
}
|
|
}
|
|
} else {
|
|
i+= run;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
LAST_SKIP_BITS(re, &s->gb, 1);
|
|
}
|
|
if (i > 62){
|
|
i-= 192;
|
|
if(i&(~63)){
|
|
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
block[scan_table[i]] = level;
|
|
break;
|
|
}
|
|
|
|
block[scan_table[i]] = level;
|
|
}
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
not_coded:
|
|
if (intra) {
|
|
if(!s->use_intra_dc_vlc){
|
|
block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
|
|
|
|
i -= i>>31; //if(i == -1) i=0;
|
|
}
|
|
|
|
mpeg4_pred_ac(s, block, n, dc_pred_dir);
|
|
if (s->ac_pred) {
|
|
i = 63; /* XXX: not optimal */
|
|
}
|
|
}
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* decode partition C of one MB.
|
|
* @return <0 if an error occurred
|
|
*/
|
|
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
|
|
{
|
|
int cbp, mb_type;
|
|
const int xy= s->mb_x + s->mb_y*s->mb_stride;
|
|
|
|
mb_type = s->current_picture.f.mb_type[xy];
|
|
cbp = s->cbp_table[xy];
|
|
|
|
s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
|
|
|
|
if (s->current_picture.f.qscale_table[xy] != s->qscale) {
|
|
ff_set_qscale(s, s->current_picture.f.qscale_table[xy]);
|
|
}
|
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
|
|
int i;
|
|
for(i=0; i<4; i++){
|
|
s->mv[0][i][0] = s->current_picture.f.motion_val[0][s->block_index[i]][0];
|
|
s->mv[0][i][1] = s->current_picture.f.motion_val[0][s->block_index[i]][1];
|
|
}
|
|
s->mb_intra = IS_INTRA(mb_type);
|
|
|
|
if (IS_SKIP(mb_type)) {
|
|
/* skip mb */
|
|
for(i=0;i<6;i++)
|
|
s->block_last_index[i] = -1;
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
s->mv_type = MV_TYPE_16X16;
|
|
if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
|
|
s->mcsel=1;
|
|
s->mb_skipped = 0;
|
|
}else{
|
|
s->mcsel=0;
|
|
s->mb_skipped = 1;
|
|
}
|
|
}else if(s->mb_intra){
|
|
s->ac_pred = IS_ACPRED(s->current_picture.f.mb_type[xy]);
|
|
}else if(!s->mb_intra){
|
|
// s->mcsel= 0; //FIXME do we need to init that
|
|
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
if (IS_8X8(mb_type)) {
|
|
s->mv_type = MV_TYPE_8X8;
|
|
} else {
|
|
s->mv_type = MV_TYPE_16X16;
|
|
}
|
|
}
|
|
} else { /* I-Frame */
|
|
s->mb_intra = 1;
|
|
s->ac_pred = IS_ACPRED(s->current_picture.f.mb_type[xy]);
|
|
}
|
|
|
|
if (!IS_SKIP(mb_type)) {
|
|
int i;
|
|
s->dsp.clear_blocks(s->block[0]);
|
|
/* decode each block */
|
|
for (i = 0; i < 6; i++) {
|
|
if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
|
|
return -1;
|
|
}
|
|
cbp+=cbp;
|
|
}
|
|
}
|
|
|
|
/* per-MB end of slice check */
|
|
|
|
if(--s->mb_num_left <= 0){
|
|
if(mpeg4_is_resync(s))
|
|
return SLICE_END;
|
|
else
|
|
return SLICE_NOEND;
|
|
}else{
|
|
if(mpeg4_is_resync(s)){
|
|
const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
|
|
if(s->cbp_table[xy+delta])
|
|
return SLICE_END;
|
|
}
|
|
return SLICE_OK;
|
|
}
|
|
}
|
|
|
|
static int mpeg4_decode_mb(MpegEncContext *s,
|
|
DCTELEM block[6][64])
|
|
{
|
|
int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
|
|
int16_t *mot_val;
|
|
static int8_t quant_tab[4] = { -1, -2, 1, 2 };
|
|
const int xy= s->mb_x + s->mb_y * s->mb_stride;
|
|
|
|
assert(s->h263_pred);
|
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {
|
|
do{
|
|
if (get_bits1(&s->gb)) {
|
|
/* skip mb */
|
|
s->mb_intra = 0;
|
|
for(i=0;i<6;i++)
|
|
s->block_last_index[i] = -1;
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
s->mv_type = MV_TYPE_16X16;
|
|
if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE){
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
|
|
s->mcsel=1;
|
|
s->mv[0][0][0]= get_amv(s, 0);
|
|
s->mv[0][0][1]= get_amv(s, 1);
|
|
|
|
s->mb_skipped = 0;
|
|
}else{
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
|
|
s->mcsel=0;
|
|
s->mv[0][0][0] = 0;
|
|
s->mv[0][0][1] = 0;
|
|
s->mb_skipped = 1;
|
|
}
|
|
goto end;
|
|
}
|
|
cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
|
|
if (cbpc < 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
}while(cbpc == 20);
|
|
|
|
s->dsp.clear_blocks(s->block[0]);
|
|
dquant = cbpc & 8;
|
|
s->mb_intra = ((cbpc & 4) != 0);
|
|
if (s->mb_intra) goto intra;
|
|
|
|
if(s->pict_type==AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
|
|
s->mcsel= get_bits1(&s->gb);
|
|
else s->mcsel= 0;
|
|
cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
|
|
|
|
cbp = (cbpc & 3) | (cbpy << 2);
|
|
if (dquant) {
|
|
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
|
|
}
|
|
if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
|
|
s->interlaced_dct= get_bits1(&s->gb);
|
|
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
if ((cbpc & 16) == 0) {
|
|
if(s->mcsel){
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
|
|
/* 16x16 global motion prediction */
|
|
s->mv_type = MV_TYPE_16X16;
|
|
mx= get_amv(s, 0);
|
|
my= get_amv(s, 1);
|
|
s->mv[0][0][0] = mx;
|
|
s->mv[0][0][1] = my;
|
|
}else if((!s->progressive_sequence) && get_bits1(&s->gb)){
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
|
|
/* 16x8 field motion prediction */
|
|
s->mv_type= MV_TYPE_FIELD;
|
|
|
|
s->field_select[0][0]= get_bits1(&s->gb);
|
|
s->field_select[0][1]= get_bits1(&s->gb);
|
|
|
|
h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
|
|
|
|
for(i=0; i<2; i++){
|
|
mx = h263_decode_motion(s, pred_x, s->f_code);
|
|
if (mx >= 0xffff)
|
|
return -1;
|
|
|
|
my = h263_decode_motion(s, pred_y/2, s->f_code);
|
|
if (my >= 0xffff)
|
|
return -1;
|
|
|
|
s->mv[0][i][0] = mx;
|
|
s->mv[0][i][1] = my;
|
|
}
|
|
}else{
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
|
|
/* 16x16 motion prediction */
|
|
s->mv_type = MV_TYPE_16X16;
|
|
h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
|
|
mx = h263_decode_motion(s, pred_x, s->f_code);
|
|
|
|
if (mx >= 0xffff)
|
|
return -1;
|
|
|
|
my = h263_decode_motion(s, pred_y, s->f_code);
|
|
|
|
if (my >= 0xffff)
|
|
return -1;
|
|
s->mv[0][0][0] = mx;
|
|
s->mv[0][0][1] = my;
|
|
}
|
|
} else {
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
|
|
s->mv_type = MV_TYPE_8X8;
|
|
for(i=0;i<4;i++) {
|
|
mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
|
|
mx = h263_decode_motion(s, pred_x, s->f_code);
|
|
if (mx >= 0xffff)
|
|
return -1;
|
|
|
|
my = h263_decode_motion(s, pred_y, s->f_code);
|
|
if (my >= 0xffff)
|
|
return -1;
|
|
s->mv[0][i][0] = mx;
|
|
s->mv[0][i][1] = my;
|
|
mot_val[0] = mx;
|
|
mot_val[1] = my;
|
|
}
|
|
}
|
|
} else if(s->pict_type==AV_PICTURE_TYPE_B) {
|
|
int modb1; // first bit of modb
|
|
int modb2; // second bit of modb
|
|
int mb_type;
|
|
|
|
s->mb_intra = 0; //B-frames never contain intra blocks
|
|
s->mcsel=0; // ... true gmc blocks
|
|
|
|
if(s->mb_x==0){
|
|
for(i=0; i<2; i++){
|
|
s->last_mv[i][0][0]=
|
|
s->last_mv[i][0][1]=
|
|
s->last_mv[i][1][0]=
|
|
s->last_mv[i][1][1]= 0;
|
|
}
|
|
|
|
ff_thread_await_progress((AVFrame*)s->next_picture_ptr, s->mb_y, 0);
|
|
}
|
|
|
|
/* if we skipped it in the future P Frame than skip it now too */
|
|
s->mb_skipped = s->next_picture.f.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
|
|
|
|
if(s->mb_skipped){
|
|
/* skip mb */
|
|
for(i=0;i<6;i++)
|
|
s->block_last_index[i] = -1;
|
|
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
s->mv_type = MV_TYPE_16X16;
|
|
s->mv[0][0][0] = 0;
|
|
s->mv[0][0][1] = 0;
|
|
s->mv[1][0][0] = 0;
|
|
s->mv[1][0][1] = 0;
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
|
|
goto end;
|
|
}
|
|
|
|
modb1= get_bits1(&s->gb);
|
|
if(modb1){
|
|
mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
|
|
cbp=0;
|
|
}else{
|
|
modb2= get_bits1(&s->gb);
|
|
mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
|
|
if(mb_type<0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
|
|
return -1;
|
|
}
|
|
mb_type= mb_type_b_map[ mb_type ];
|
|
if(modb2) cbp= 0;
|
|
else{
|
|
s->dsp.clear_blocks(s->block[0]);
|
|
cbp= get_bits(&s->gb, 6);
|
|
}
|
|
|
|
if ((!IS_DIRECT(mb_type)) && cbp) {
|
|
if(get_bits1(&s->gb)){
|
|
ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
|
|
}
|
|
}
|
|
|
|
if(!s->progressive_sequence){
|
|
if(cbp)
|
|
s->interlaced_dct= get_bits1(&s->gb);
|
|
|
|
if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
|
|
mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
|
|
mb_type &= ~MB_TYPE_16x16;
|
|
|
|
if(USES_LIST(mb_type, 0)){
|
|
s->field_select[0][0]= get_bits1(&s->gb);
|
|
s->field_select[0][1]= get_bits1(&s->gb);
|
|
}
|
|
if(USES_LIST(mb_type, 1)){
|
|
s->field_select[1][0]= get_bits1(&s->gb);
|
|
s->field_select[1][1]= get_bits1(&s->gb);
|
|
}
|
|
}
|
|
}
|
|
|
|
s->mv_dir = 0;
|
|
if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
|
|
s->mv_type= MV_TYPE_16X16;
|
|
|
|
if(USES_LIST(mb_type, 0)){
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
|
|
mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
|
|
my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
|
|
s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
|
|
s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
|
|
}
|
|
|
|
if(USES_LIST(mb_type, 1)){
|
|
s->mv_dir |= MV_DIR_BACKWARD;
|
|
|
|
mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
|
|
my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
|
|
s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
|
|
s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
|
|
}
|
|
}else if(!IS_DIRECT(mb_type)){
|
|
s->mv_type= MV_TYPE_FIELD;
|
|
|
|
if(USES_LIST(mb_type, 0)){
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
|
|
for(i=0; i<2; i++){
|
|
mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
|
|
my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
|
|
s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
|
|
s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
|
|
}
|
|
}
|
|
|
|
if(USES_LIST(mb_type, 1)){
|
|
s->mv_dir |= MV_DIR_BACKWARD;
|
|
|
|
for(i=0; i<2; i++){
|
|
mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
|
|
my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
|
|
s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
|
|
s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if(IS_DIRECT(mb_type)){
|
|
if(IS_SKIP(mb_type))
|
|
mx=my=0;
|
|
else{
|
|
mx = h263_decode_motion(s, 0, 1);
|
|
my = h263_decode_motion(s, 0, 1);
|
|
}
|
|
|
|
s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
|
|
mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
|
|
}
|
|
s->current_picture.f.mb_type[xy] = mb_type;
|
|
} else { /* I-Frame */
|
|
do{
|
|
cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
|
|
if (cbpc < 0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
}while(cbpc == 8);
|
|
|
|
dquant = cbpc & 4;
|
|
s->mb_intra = 1;
|
|
intra:
|
|
s->ac_pred = get_bits1(&s->gb);
|
|
if(s->ac_pred)
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
|
|
else
|
|
s->current_picture.f.mb_type[xy] = MB_TYPE_INTRA;
|
|
|
|
cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
|
|
if(cbpy<0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
cbp = (cbpc & 3) | (cbpy << 2);
|
|
|
|
s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
|
|
|
|
if (dquant) {
|
|
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
|
|
}
|
|
|
|
if(!s->progressive_sequence)
|
|
s->interlaced_dct= get_bits1(&s->gb);
|
|
|
|
s->dsp.clear_blocks(s->block[0]);
|
|
/* decode each block */
|
|
for (i = 0; i < 6; i++) {
|
|
if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
|
|
return -1;
|
|
cbp+=cbp;
|
|
}
|
|
goto end;
|
|
}
|
|
|
|
/* decode each block */
|
|
for (i = 0; i < 6; i++) {
|
|
if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
|
|
return -1;
|
|
cbp+=cbp;
|
|
}
|
|
end:
|
|
|
|
/* per-MB end of slice check */
|
|
if(s->codec_id==CODEC_ID_MPEG4){
|
|
if(mpeg4_is_resync(s)){
|
|
const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
|
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.f.mbskip_table[xy + delta]) {
|
|
ff_thread_await_progress((AVFrame*)s->next_picture_ptr,
|
|
(s->mb_x + delta >= s->mb_width) ? FFMIN(s->mb_y+1, s->mb_height-1) : s->mb_y, 0);
|
|
}
|
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture.f.mbskip_table[xy + delta])
|
|
return SLICE_OK;
|
|
return SLICE_END;
|
|
}
|
|
}
|
|
|
|
return SLICE_OK;
|
|
}
|
|
|
|
|
|
static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
|
|
int hours, minutes, seconds;
|
|
unsigned time_code = show_bits(gb, 18);
|
|
|
|
if (time_code & 0x40) { /* marker_bit */
|
|
hours = time_code >> 13;
|
|
minutes = time_code >> 7 & 0x3f;
|
|
seconds = time_code & 0x3f;
|
|
s->time_base = seconds + 60*(minutes + 60*hours);
|
|
skip_bits(gb, 20); /* time_code, closed_gov, broken_link */
|
|
} else {
|
|
av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mpeg4_decode_profile_level(MpegEncContext * s, GetBitContext *gb){
|
|
int profile_and_level_indication;
|
|
|
|
profile_and_level_indication = get_bits(gb, 8);
|
|
|
|
s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4;
|
|
s->avctx->level = (profile_and_level_indication & 0x0f);
|
|
|
|
// for Simple profile, level 0
|
|
if (s->avctx->profile == 0 && s->avctx->level == 8) {
|
|
s->avctx->level = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
|
|
int width, height, vo_ver_id;
|
|
|
|
/* vol header */
|
|
skip_bits(gb, 1); /* random access */
|
|
s->vo_type= get_bits(gb, 8);
|
|
if (get_bits1(gb) != 0) { /* is_ol_id */
|
|
vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
|
|
skip_bits(gb, 3); /* vo_priority */
|
|
} else {
|
|
vo_ver_id = 1;
|
|
}
|
|
s->aspect_ratio_info= get_bits(gb, 4);
|
|
if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
|
|
s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
|
|
s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
|
|
}else{
|
|
s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
|
|
}
|
|
|
|
if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
|
|
int chroma_format= get_bits(gb, 2);
|
|
if(chroma_format!=CHROMA_420){
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
|
|
}
|
|
s->low_delay= get_bits1(gb);
|
|
if(get_bits1(gb)){ /* vbv parameters */
|
|
get_bits(gb, 15); /* first_half_bitrate */
|
|
skip_bits1(gb); /* marker */
|
|
get_bits(gb, 15); /* latter_half_bitrate */
|
|
skip_bits1(gb); /* marker */
|
|
get_bits(gb, 15); /* first_half_vbv_buffer_size */
|
|
skip_bits1(gb); /* marker */
|
|
get_bits(gb, 3); /* latter_half_vbv_buffer_size */
|
|
get_bits(gb, 11); /* first_half_vbv_occupancy */
|
|
skip_bits1(gb); /* marker */
|
|
get_bits(gb, 15); /* latter_half_vbv_occupancy */
|
|
skip_bits1(gb); /* marker */
|
|
}
|
|
}else{
|
|
// set low delay flag only once the smartest? low delay detection won't be overriden
|
|
if(s->picture_number==0)
|
|
s->low_delay=0;
|
|
}
|
|
|
|
s->shape = get_bits(gb, 2); /* vol shape */
|
|
if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
|
|
if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
|
|
av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
|
|
skip_bits(gb, 4); //video_object_layer_shape_extension
|
|
}
|
|
|
|
check_marker(gb, "before time_increment_resolution");
|
|
|
|
s->avctx->time_base.den = get_bits(gb, 16);
|
|
if(!s->avctx->time_base.den){
|
|
av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
|
|
s->avctx->time_base.num = 0;
|
|
return -1;
|
|
}
|
|
|
|
s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
|
|
if (s->time_increment_bits < 1)
|
|
s->time_increment_bits = 1;
|
|
|
|
check_marker(gb, "before fixed_vop_rate");
|
|
|
|
if (get_bits1(gb) != 0) { /* fixed_vop_rate */
|
|
s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
|
|
}else
|
|
s->avctx->time_base.num = 1;
|
|
|
|
s->t_frame=0;
|
|
|
|
if (s->shape != BIN_ONLY_SHAPE) {
|
|
if (s->shape == RECT_SHAPE) {
|
|
skip_bits1(gb); /* marker */
|
|
width = get_bits(gb, 13);
|
|
skip_bits1(gb); /* marker */
|
|
height = get_bits(gb, 13);
|
|
skip_bits1(gb); /* marker */
|
|
if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
|
|
s->width = width;
|
|
s->height = height;
|
|
}
|
|
}
|
|
|
|
s->progressive_sequence=
|
|
s->progressive_frame= get_bits1(gb)^1;
|
|
s->interlaced_dct=0;
|
|
if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
|
|
av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
|
|
if (vo_ver_id == 1) {
|
|
s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
|
|
} else {
|
|
s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
|
|
}
|
|
if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
|
|
if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
|
|
if(s->vol_sprite_usage==STATIC_SPRITE){
|
|
s->sprite_width = get_bits(gb, 13);
|
|
skip_bits1(gb); /* marker */
|
|
s->sprite_height= get_bits(gb, 13);
|
|
skip_bits1(gb); /* marker */
|
|
s->sprite_left = get_bits(gb, 13);
|
|
skip_bits1(gb); /* marker */
|
|
s->sprite_top = get_bits(gb, 13);
|
|
skip_bits1(gb); /* marker */
|
|
}
|
|
s->num_sprite_warping_points= get_bits(gb, 6);
|
|
if(s->num_sprite_warping_points > 3){
|
|
av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
|
|
s->num_sprite_warping_points= 0;
|
|
return -1;
|
|
}
|
|
s->sprite_warping_accuracy = get_bits(gb, 2);
|
|
s->sprite_brightness_change= get_bits1(gb);
|
|
if(s->vol_sprite_usage==STATIC_SPRITE)
|
|
s->low_latency_sprite= get_bits1(gb);
|
|
}
|
|
// FIXME sadct disable bit if verid!=1 && shape not rect
|
|
|
|
if (get_bits1(gb) == 1) { /* not_8_bit */
|
|
s->quant_precision = get_bits(gb, 4); /* quant_precision */
|
|
if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
|
|
if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
|
|
} else {
|
|
s->quant_precision = 5;
|
|
}
|
|
|
|
// FIXME a bunch of grayscale shape things
|
|
|
|
if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
|
|
int i, v;
|
|
|
|
/* load default matrixes */
|
|
for(i=0; i<64; i++){
|
|
int j= s->dsp.idct_permutation[i];
|
|
v= ff_mpeg4_default_intra_matrix[i];
|
|
s->intra_matrix[j]= v;
|
|
s->chroma_intra_matrix[j]= v;
|
|
|
|
v= ff_mpeg4_default_non_intra_matrix[i];
|
|
s->inter_matrix[j]= v;
|
|
s->chroma_inter_matrix[j]= v;
|
|
}
|
|
|
|
/* load custom intra matrix */
|
|
if(get_bits1(gb)){
|
|
int last=0;
|
|
for(i=0; i<64; i++){
|
|
int j;
|
|
v= get_bits(gb, 8);
|
|
if(v==0) break;
|
|
|
|
last= v;
|
|
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->intra_matrix[j]= v;
|
|
s->chroma_intra_matrix[j]= v;
|
|
}
|
|
|
|
/* replicate last value */
|
|
for(; i<64; i++){
|
|
int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->intra_matrix[j]= last;
|
|
s->chroma_intra_matrix[j]= last;
|
|
}
|
|
}
|
|
|
|
/* load custom non intra matrix */
|
|
if(get_bits1(gb)){
|
|
int last=0;
|
|
for(i=0; i<64; i++){
|
|
int j;
|
|
v= get_bits(gb, 8);
|
|
if(v==0) break;
|
|
|
|
last= v;
|
|
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->inter_matrix[j]= v;
|
|
s->chroma_inter_matrix[j]= v;
|
|
}
|
|
|
|
/* replicate last value */
|
|
for(; i<64; i++){
|
|
int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->inter_matrix[j]= last;
|
|
s->chroma_inter_matrix[j]= last;
|
|
}
|
|
}
|
|
|
|
// FIXME a bunch of grayscale shape things
|
|
}
|
|
|
|
if(vo_ver_id != 1)
|
|
s->quarter_sample= get_bits1(gb);
|
|
else s->quarter_sample=0;
|
|
|
|
if(!get_bits1(gb)){
|
|
int pos= get_bits_count(gb);
|
|
int estimation_method= get_bits(gb, 2);
|
|
if(estimation_method<2){
|
|
if(!get_bits1(gb)){
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
|
|
}
|
|
if(!get_bits1(gb)){
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
|
|
s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
|
|
s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
|
|
}
|
|
if(!check_marker(gb, "in complexity estimation part 1")){
|
|
skip_bits_long(gb, pos - get_bits_count(gb));
|
|
goto no_cplx_est;
|
|
}
|
|
if(!get_bits1(gb)){
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
|
|
s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
|
|
}
|
|
if(!get_bits1(gb)){
|
|
s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
|
|
s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
|
|
s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
|
|
s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
|
|
s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
|
|
s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
|
|
}
|
|
if(!check_marker(gb, "in complexity estimation part 2")){
|
|
skip_bits_long(gb, pos - get_bits_count(gb));
|
|
goto no_cplx_est;
|
|
}
|
|
if(estimation_method==1){
|
|
s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
|
|
s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
|
|
}
|
|
}else
|
|
av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
|
|
}else{
|
|
no_cplx_est:
|
|
s->cplx_estimation_trash_i=
|
|
s->cplx_estimation_trash_p=
|
|
s->cplx_estimation_trash_b= 0;
|
|
}
|
|
|
|
s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
|
|
|
|
s->data_partitioning= get_bits1(gb);
|
|
if(s->data_partitioning){
|
|
s->rvlc= get_bits1(gb);
|
|
}
|
|
|
|
if(vo_ver_id != 1) {
|
|
s->new_pred= get_bits1(gb);
|
|
if(s->new_pred){
|
|
av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
|
|
skip_bits(gb, 2); /* requested upstream message type */
|
|
skip_bits1(gb); /* newpred segment type */
|
|
}
|
|
s->reduced_res_vop= get_bits1(gb);
|
|
if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
|
|
}
|
|
else{
|
|
s->new_pred=0;
|
|
s->reduced_res_vop= 0;
|
|
}
|
|
|
|
s->scalability= get_bits1(gb);
|
|
|
|
if (s->scalability) {
|
|
GetBitContext bak= *gb;
|
|
int h_sampling_factor_n;
|
|
int h_sampling_factor_m;
|
|
int v_sampling_factor_n;
|
|
int v_sampling_factor_m;
|
|
|
|
s->hierachy_type= get_bits1(gb);
|
|
skip_bits(gb, 4); /* ref_layer_id */
|
|
skip_bits1(gb); /* ref_layer_sampling_dir */
|
|
h_sampling_factor_n= get_bits(gb, 5);
|
|
h_sampling_factor_m= get_bits(gb, 5);
|
|
v_sampling_factor_n= get_bits(gb, 5);
|
|
v_sampling_factor_m= get_bits(gb, 5);
|
|
s->enhancement_type= get_bits1(gb);
|
|
|
|
if( h_sampling_factor_n==0 || h_sampling_factor_m==0
|
|
|| v_sampling_factor_n==0 || v_sampling_factor_m==0){
|
|
/* illegal scalability header (VERY broken encoder),
|
|
* trying to workaround */
|
|
s->scalability=0;
|
|
*gb= bak;
|
|
}else
|
|
av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
|
|
|
|
// bin shape stuff FIXME
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* decodes the user data stuff in the header.
|
|
* Also initializes divx/xvid/lavc_version/build.
|
|
*/
|
|
static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
|
|
char buf[256];
|
|
int i;
|
|
int e;
|
|
int ver = 0, build = 0, ver2 = 0, ver3 = 0;
|
|
char last;
|
|
|
|
for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
|
|
if(show_bits(gb, 23) == 0) break;
|
|
buf[i]= get_bits(gb, 8);
|
|
}
|
|
buf[i]=0;
|
|
|
|
/* divx detection */
|
|
e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
|
|
if(e<2)
|
|
e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
|
|
if(e>=2){
|
|
s->divx_version= ver;
|
|
s->divx_build= build;
|
|
s->divx_packed= e==3 && last=='p';
|
|
if(s->divx_packed && !s->showed_packed_warning) {
|
|
av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
|
|
s->showed_packed_warning=1;
|
|
}
|
|
}
|
|
|
|
/* ffmpeg detection */
|
|
e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
|
|
if(e!=4)
|
|
e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
|
|
if(e!=4){
|
|
e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
|
|
if (e>1)
|
|
build= (ver<<16) + (ver2<<8) + ver3;
|
|
}
|
|
if(e!=4){
|
|
if(strcmp(buf, "ffmpeg")==0){
|
|
s->lavc_build= 4600;
|
|
}
|
|
}
|
|
if(e==4){
|
|
s->lavc_build= build;
|
|
}
|
|
|
|
/* Xvid detection */
|
|
e=sscanf(buf, "XviD%d", &build);
|
|
if(e==1){
|
|
s->xvid_build= build;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
|
|
int time_incr, time_increment;
|
|
|
|
s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
|
|
if(s->pict_type==AV_PICTURE_TYPE_B && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
|
|
av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
|
|
s->low_delay=0;
|
|
}
|
|
|
|
s->partitioned_frame= s->data_partitioning && s->pict_type!=AV_PICTURE_TYPE_B;
|
|
if(s->partitioned_frame)
|
|
s->decode_mb= mpeg4_decode_partitioned_mb;
|
|
else
|
|
s->decode_mb= mpeg4_decode_mb;
|
|
|
|
time_incr=0;
|
|
while (get_bits1(gb) != 0)
|
|
time_incr++;
|
|
|
|
check_marker(gb, "before time_increment");
|
|
|
|
if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
|
|
av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
|
|
|
|
for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
|
|
if ( s->pict_type == AV_PICTURE_TYPE_P
|
|
|| (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE)) {
|
|
if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
|
|
}else
|
|
if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
|
|
}
|
|
|
|
av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
|
|
}
|
|
|
|
if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
|
|
else time_increment= get_bits(gb, s->time_increment_bits);
|
|
|
|
if(s->pict_type!=AV_PICTURE_TYPE_B){
|
|
s->last_time_base= s->time_base;
|
|
s->time_base+= time_incr;
|
|
s->time= s->time_base*s->avctx->time_base.den + time_increment;
|
|
if(s->workaround_bugs&FF_BUG_UMP4){
|
|
if(s->time < s->last_non_b_time){
|
|
/* header is not mpeg-4-compatible, broken encoder,
|
|
* trying to workaround */
|
|
s->time_base++;
|
|
s->time+= s->avctx->time_base.den;
|
|
}
|
|
}
|
|
s->pp_time= s->time - s->last_non_b_time;
|
|
s->last_non_b_time= s->time;
|
|
}else{
|
|
s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
|
|
s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
|
|
if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
|
|
/* messed up order, maybe after seeking? skipping current b-frame */
|
|
return FRAME_SKIPPED;
|
|
}
|
|
ff_mpeg4_init_direct_mv(s);
|
|
|
|
if(s->t_frame==0) s->t_frame= s->pb_time;
|
|
if(s->t_frame==0) s->t_frame=1; // 1/0 protection
|
|
s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
|
|
- ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
|
|
s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
|
|
- ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
|
|
if(!s->progressive_sequence){
|
|
if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
|
|
return FRAME_SKIPPED;
|
|
}
|
|
}
|
|
|
|
if(s->avctx->time_base.num)
|
|
s->current_picture_ptr->f.pts = (s->time + s->avctx->time_base.num / 2) / s->avctx->time_base.num;
|
|
else
|
|
s->current_picture_ptr->f.pts = AV_NOPTS_VALUE;
|
|
if(s->avctx->debug&FF_DEBUG_PTS)
|
|
av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
|
|
s->current_picture_ptr->f.pts);
|
|
|
|
check_marker(gb, "before vop_coded");
|
|
|
|
/* vop coded */
|
|
if (get_bits1(gb) != 1){
|
|
if(s->avctx->debug&FF_DEBUG_PICT_INFO)
|
|
av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
|
|
return FRAME_SKIPPED;
|
|
}
|
|
if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == AV_PICTURE_TYPE_P
|
|
|| (s->pict_type == AV_PICTURE_TYPE_S && s->vol_sprite_usage==GMC_SPRITE))) {
|
|
/* rounding type for motion estimation */
|
|
s->no_rounding = get_bits1(gb);
|
|
} else {
|
|
s->no_rounding = 0;
|
|
}
|
|
//FIXME reduced res stuff
|
|
|
|
if (s->shape != RECT_SHAPE) {
|
|
if (s->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
|
|
skip_bits(gb, 13); /* width */
|
|
skip_bits1(gb); /* marker */
|
|
skip_bits(gb, 13); /* height */
|
|
skip_bits1(gb); /* marker */
|
|
skip_bits(gb, 13); /* hor_spat_ref */
|
|
skip_bits1(gb); /* marker */
|
|
skip_bits(gb, 13); /* ver_spat_ref */
|
|
}
|
|
skip_bits1(gb); /* change_CR_disable */
|
|
|
|
if (get_bits1(gb) != 0) {
|
|
skip_bits(gb, 8); /* constant_alpha_value */
|
|
}
|
|
}
|
|
//FIXME complexity estimation stuff
|
|
|
|
if (s->shape != BIN_ONLY_SHAPE) {
|
|
skip_bits_long(gb, s->cplx_estimation_trash_i);
|
|
if(s->pict_type != AV_PICTURE_TYPE_I)
|
|
skip_bits_long(gb, s->cplx_estimation_trash_p);
|
|
if(s->pict_type == AV_PICTURE_TYPE_B)
|
|
skip_bits_long(gb, s->cplx_estimation_trash_b);
|
|
|
|
s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ];
|
|
if(!s->progressive_sequence){
|
|
s->top_field_first= get_bits1(gb);
|
|
s->alternate_scan= get_bits1(gb);
|
|
}else
|
|
s->alternate_scan= 0;
|
|
}
|
|
|
|
if(s->alternate_scan){
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
|
|
} else{
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
|
|
}
|
|
|
|
if(s->pict_type == AV_PICTURE_TYPE_S && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
|
|
mpeg4_decode_sprite_trajectory(s, gb);
|
|
if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
|
|
if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
|
|
}
|
|
|
|
if (s->shape != BIN_ONLY_SHAPE) {
|
|
s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
|
|
if(s->qscale==0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
|
|
return -1; // makes no sense to continue, as there is nothing left from the image then
|
|
}
|
|
|
|
if (s->pict_type != AV_PICTURE_TYPE_I) {
|
|
s->f_code = get_bits(gb, 3); /* fcode_for */
|
|
if(s->f_code==0){
|
|
av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
|
|
return -1; // makes no sense to continue, as the MV decoding will break very quickly
|
|
}
|
|
}else
|
|
s->f_code=1;
|
|
|
|
if (s->pict_type == AV_PICTURE_TYPE_B) {
|
|
s->b_code = get_bits(gb, 3);
|
|
}else
|
|
s->b_code=1;
|
|
|
|
if(s->avctx->debug&FF_DEBUG_PICT_INFO){
|
|
av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n",
|
|
s->qscale, s->f_code, s->b_code,
|
|
s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
|
|
gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
|
|
s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
|
|
s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold, s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b);
|
|
}
|
|
|
|
if(!s->scalability){
|
|
if (s->shape!=RECT_SHAPE && s->pict_type!=AV_PICTURE_TYPE_I) {
|
|
skip_bits1(gb); // vop shape coding type
|
|
}
|
|
}else{
|
|
if(s->enhancement_type){
|
|
int load_backward_shape= get_bits1(gb);
|
|
if(load_backward_shape){
|
|
av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
|
|
}
|
|
}
|
|
skip_bits(gb, 2); //ref_select_code
|
|
}
|
|
}
|
|
/* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
|
|
// note we cannot detect divx5 without b-frames easily (although it's buggy too)
|
|
if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==-1 && s->picture_number==0){
|
|
av_log(s->avctx, AV_LOG_WARNING, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
|
|
s->low_delay=1;
|
|
}
|
|
|
|
s->picture_number++; // better than pic number==0 always ;)
|
|
|
|
s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
|
|
s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
|
|
|
|
if(s->workaround_bugs&FF_BUG_EDGE){
|
|
s->h_edge_pos= s->width;
|
|
s->v_edge_pos= s->height;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* decode mpeg4 headers
|
|
* @return <0 if no VOP found (or a damaged one)
|
|
* FRAME_SKIPPED if a not coded VOP is found
|
|
* 0 if a VOP is found
|
|
*/
|
|
int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
|
|
{
|
|
int startcode, v;
|
|
|
|
/* search next start code */
|
|
align_get_bits(gb);
|
|
|
|
if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
|
|
skip_bits(gb, 24);
|
|
if(get_bits(gb, 8) == 0xF0)
|
|
goto end;
|
|
}
|
|
|
|
startcode = 0xff;
|
|
for(;;) {
|
|
if(get_bits_count(gb) >= gb->size_in_bits){
|
|
if(gb->size_in_bits==8 && (s->divx_version>=0 || s->xvid_build>=0)){
|
|
av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
|
|
return FRAME_SKIPPED; //divx bug
|
|
}else
|
|
return -1; //end of stream
|
|
}
|
|
|
|
/* use the bits after the test */
|
|
v = get_bits(gb, 8);
|
|
startcode = ((startcode << 8) | v) & 0xffffffff;
|
|
|
|
if((startcode&0xFFFFFF00) != 0x100)
|
|
continue; //no startcode
|
|
|
|
if(s->avctx->debug&FF_DEBUG_STARTCODE){
|
|
av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
|
|
if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
|
|
else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
|
|
else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
|
|
else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
|
|
else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
|
|
else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
|
|
else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
|
|
else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
|
|
else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
|
|
else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
|
|
else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
|
|
else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
|
|
else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
|
|
else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
|
|
else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
|
|
else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
|
|
else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
|
|
else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
|
|
else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
|
|
else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
|
|
else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
|
|
else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
|
|
else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
|
|
else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
|
|
else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
|
|
else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
|
|
else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
|
|
av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
|
|
}
|
|
|
|
if(startcode >= 0x120 && startcode <= 0x12F){
|
|
if(decode_vol_header(s, gb) < 0)
|
|
return -1;
|
|
}
|
|
else if(startcode == USER_DATA_STARTCODE){
|
|
decode_user_data(s, gb);
|
|
}
|
|
else if(startcode == GOP_STARTCODE){
|
|
mpeg4_decode_gop_header(s, gb);
|
|
}
|
|
else if(startcode == VOS_STARTCODE){
|
|
mpeg4_decode_profile_level(s, gb);
|
|
}
|
|
else if(startcode == VOP_STARTCODE){
|
|
break;
|
|
}
|
|
|
|
align_get_bits(gb);
|
|
startcode = 0xff;
|
|
}
|
|
end:
|
|
if(s->flags& CODEC_FLAG_LOW_DELAY)
|
|
s->low_delay=1;
|
|
s->avctx->has_b_frames= !s->low_delay;
|
|
return decode_vop_header(s, gb);
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
MpegEncContext *s = avctx->priv_data;
|
|
int ret;
|
|
static int done = 0;
|
|
|
|
s->divx_version=
|
|
s->divx_build=
|
|
s->xvid_build=
|
|
s->lavc_build= -1;
|
|
|
|
if((ret=ff_h263_decode_init(avctx)) < 0)
|
|
return ret;
|
|
|
|
if (!done) {
|
|
done = 1;
|
|
|
|
init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
|
|
init_rl(&rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
|
|
init_rl(&rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
|
|
INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
|
|
INIT_VLC_RL(rvlc_rl_inter, 1072);
|
|
INIT_VLC_RL(rvlc_rl_intra, 1072);
|
|
INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
|
|
&ff_mpeg4_DCtab_lum[0][1], 2, 1,
|
|
&ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
|
|
INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
|
|
&ff_mpeg4_DCtab_chrom[0][1], 2, 1,
|
|
&ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
|
|
INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
|
|
&sprite_trajectory_tab[0][1], 4, 2,
|
|
&sprite_trajectory_tab[0][0], 4, 2, 128);
|
|
INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
|
|
&mb_type_b_tab[0][1], 2, 1,
|
|
&mb_type_b_tab[0][0], 2, 1, 16);
|
|
}
|
|
|
|
s->h263_pred = 1;
|
|
s->low_delay = 0; //default, might be overriden in the vol header during header parsing
|
|
s->decode_mb= mpeg4_decode_mb;
|
|
s->time_increment_bits = 4; /* default value for broken headers */
|
|
avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_mpeg4_decoder = {
|
|
"mpeg4",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_MPEG4,
|
|
sizeof(MpegEncContext),
|
|
decode_init,
|
|
NULL,
|
|
ff_h263_decode_end,
|
|
ff_h263_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_FRAME_THREADS,
|
|
.flush= ff_mpeg_flush,
|
|
.max_lowres= 3,
|
|
.long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
|
|
.pix_fmts= ff_hwaccel_pixfmt_list_420,
|
|
.update_thread_context= ONLY_IF_THREADS_ENABLED(ff_mpeg_update_thread_context)
|
|
};
|
|
|
|
|
|
#if CONFIG_MPEG4_VDPAU_DECODER
|
|
AVCodec ff_mpeg4_vdpau_decoder = {
|
|
"mpeg4_vdpau",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_MPEG4,
|
|
sizeof(MpegEncContext),
|
|
decode_init,
|
|
NULL,
|
|
ff_h263_decode_end,
|
|
ff_h263_decode_frame,
|
|
CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
|
|
.long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
|
|
.pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE},
|
|
};
|
|
#endif
|